/het'euh rol"euh geuhs/ , adj.
1. Biol. of different origin; pertaining to heterology.
2. Med. , Pathol. consisting of dissimilar tissue, as that of another species or that of a tumor.
3. Immunol. pertaining to an antigen that elicits a reaction in a nonspecific antibody.
[ 1815-25; HETERO- + -LOGOUS ]